Typewriting machine



Feb. 23, 1932. R. v. REPPERT TYPEWRITING MACHINE Filed April 15, 1927 I- d W lllletented lieb., Z, "i932 V. REIPPERT, vF HARTFORD, CONNECTICUT? SSIGNOR TO UNDERWOD Elbmll FISHER COMPANY, F NEW YRR N. Y., A. CORPORATION DE DELWMM 'rrrzawnrrrne mennen application nea anni nr rear.

'llbis invention relates to an improvement in typewriting machines and more particularly to the lrey mechanism thereol'and has lor its main object to provide a noiselessly operable liey mechanism() whereby printing is accomplished by an instantaneous pressure instead or .an impact.

l further obj ect is to provide a type inember positioning mechanism, whereby the operation oi a bey moves the respective type member to printing position9 adjacent to the platen.l

lli'iother object is to provide a universal pressure printing member subject to actuation by any one oit the lreys and adapted to engage and press against the platen tor print ing operation, snob one oit the type members has been moved to printing position .another object is to provide a key mecha nism having two functions., one, to set the 're-- spective type member in printing position and. the other, to actuate the universal print- :T o' member; these tivo 'functions being synmaimedAJ so that the printing member con Twith the type member 'when arrives approximate println o i d reby be t a 'universal msm, snbj'aect t ie lie" s,

pressure against the t lnother obiect to provide a i niversal t printenoa nieclr nism and aA ing clerics therertor, designed to move it trom rest with harmonic motion to thereby overcome its inertia graduallyl A still further object is to mount a Weight member in a yielding or flexible manner., so that its rebound action Will aid in quickly breaking the toggle for resetting movement lin the accompanying drawings, only one type member and key action is shown, as being representative of all and the support ing trarneA Work has been eliminatedas being immaterial and of any suitable structure Figure l is a fragmentary side elevation ot one ci the key actions and the printing device and shows the device in normal position in full lines and in actuated position in dotted lines.

lligure 2 is a detail of the guide plate with the rebound rail.

liigure 3 is a iront elevation oil an end bar, showing the bevel gear modification olf the laterally disposed sector members 3.,

'lbe typewriter keys l are pivoted on the shalt 2 and the rear extensions thereof carry pins l to actuate the sectors 3 by engaging the slots therein. @he sectors 3 are mounted on the transverse shaft d and actuate with the sector levers 5 pivoted on shaft 6 and these levers carry pins 'l' on their upper endsfwhich actaate tlieitype members 99 pivoted on shaft @Q byengaging the slotted extensions 8 thereoiln 'llie type members are preferably carried in radial slots oiia segment block (not shown and are tnlcrumed on the curved shalt t, on l-which the sector levers 5 are piimted9 is mounted and carved in a similar manner. 'llo provide that the laterally disposed sectors 3 may properly engage the radim ally extending sectors 5, the upper ends oil sectors 3 are bent to form a section ci a bevel gear7 as is shown in Figure l? and as they are ot varying heights or lengths, the slot and connections between the ltey ex tensions and the sectors are positioned to obtain complete connection oit the 'type members inthe customary manner and thelill by the operation of the respective key. The type members are pivoted on the shaft 8 and y a thin rod 9 connects the type head 10 with convenient means for carrying the type, they can be of light construction and are preferably moved with harmonic motion from normal position and moved with harmonic motion to come to a stop, when positioned for printing. To this end the slotted extensions 8 of the type members are normally disposed with the slots at approximately right angles to the actuatinglevers 5 and with the pins 7 thereon in the extreme ends of the slots, as shown in Figure 1. By these means, movement of uniform velocity of an actuating lever 5, by its key, will impart gradually accelera-ted movement to the type bar, until the actuating lever has moved half of its distance and will then impart gradually decelerated movement to the type bar and completely stop it when the lever isat right angles to the slot. By these means the inertia of the type bar at rest is readily overcome and its momentum, when moving fast, is gradually absorbed in a useful manner, as it acts on the actuating lever and helps to move the key down and thereby helps to actuate the printing device.

A guide member 12 is suitably mounted near the platen and two projections 13 thereon, form a guide slot for the rods 9 of .the type members to guide them laterally during the last part ofthe travel. (See Fig. -2.) The guide member 12 also has a projecting rail 12" against which the rod 9 of a type member bears, when the key is in actuated position and in this positionvthe type head 10 is a short distance from the platen 11. Normally, the keys are held in upper position *against tlie rubber bumper 16 by the spring 17 and are subject to operation to assume the position shown in dotted lines, withthe nether edge against the bumper 15. Upon operation of a key, the respective type member will be moved with harmonic motion to printing position, that is, it Will move with gradually accelerated velocity and then with decelerated velocity until the type member stops in printing position with the type head adjacent to the -platen and the rodin the guide slot and against the rebound rail, as is shown in dotted lines. t

A universal pressure printing mechanism is provided to engage and `move to print any type member that has'been set in printing position by its key. j This printing mechanism comprises a double toggle linkage having a pressure member to engage the type head,

and this mechanism is actuated by a universal bail frame which, in turn, is subject to actuation by any one of the keys. The bail frame starts the printing mechanism from rest with harmonic motion to thereby overcome its inertia gradually and obtaina smooth key action. The double toggle linkage is provided lever to the rear arm ofthe curved lever 23 pivoted on the stud 24" and held in normal position bythe spring 25. The lever23 is a i.

part of the first toggle linkage provided to engage and actuate the type head for printing operation. A pressure printing member 26 is slidingly mounted in the guide plates 27, suitably mounted in the machine and a link 28 connects this member to the lever 29v pivoted on stud 30 and the link 31 connects the lever 29 to the lever 23, thereby completing the linkage] The operation of-a key will simultaneously move a type member, as described and actuate the bail frame 18, and the lever 21 thereon, will actuate the lever 23 with gradually accelerated velocity, therebyl overcoming the inertia of this mechanism very gradually. The pressure printing member 26 will move rearward to engage the type head 10 of the type `member and for an instant press it against the platen for printing operation, thereby flexing the rod 9 of the type member, which therefore will rebound upon resetting movement of the printing member.

The synchronization of the movement of a type member and the pressure printing member is indicated by the dash and dotted lines identified by letters .and similar letters indicate the relative positions of the two mem-- bers at a given phase of the movement. It will be seen that-the pressure printing member comes in contact with the type head when the latter has arrived'in/printing position, and the parts are shown in this position in dotted lines.

To provide Imeans for, storing kinetic] stroke and tend to straighten out the toggle il li remesas type ot machine, to maintain'a low and balanced key resistence and a quick resetting movement of all of the parts actuated by the ke s.

ln view ot this it is undesirable to provide a direct pressure transmission for the keys to the type head or a single toggle mechanism, as such devices would be slow to reset and require a large mass with undesirable inertia. By reason of the double toggle mechanism provided herein, the mass to be moved by the keys is such, that its inertia is not ot undesirable magnitude and the provision ot a small and flexibly mounted mass in the tirst toggle linkage tor the purpose of storing kinetic energy. therein for printing purposes,'assures a rebound means and theretore a quick resetting action of the devices.

'lo overcome the inertia ot the mass represented by the universal printing mechanism, it is started trom rest by the keys with harmonic motion.

During the first part of the key stroke, 'the main resistence is caused by the positioning movement of the type member and as this resistence diminishes, the resistence of the pressure printing linkage increases, 'thereby balancing the key resistence tor the entire key stroke.

Variations may be resorted to within the scope ol the invention, and portions of the improvements may be used without others.

Having thus described my invention, l claim:

l. ln a typewriting machine, the combination with a key and a type-member, of meshed gears between the key and said member, and additional means, including lever-arms between the gears and the type-member, actuated by said gears effective upon movement ot the key to transmit harmonic motion to the type-member 'to carry it into typing position. f f

ln a typewriting machine, the combination with a type-member and a key, of a keyactuated sector-lever, a `second sector-lever to mesh with the same, and additional means, including motion-transmitting arms between the second sector-lever and the type-member, actuated by said sector-lever, lor transmitting harmonic motion from the key to said type-member to carry it into typing position.

3. ln a. typewriting machine, the combination with a key, of a t pe-member having an elongated opening, a 4vey-actuated sectorlever, a second sector-lever meshed with the key-actuated sector-lever, and a pin carried by the latter engaging said opening tor transmitting harmonic motion from the key to said type-member to carry it into typing position.

fl. ln a typewriting machine, the combination or a platen, a key, a type-member, an ertension therefor, a sector-lever engaging said extension to operate said member, a

sector bell-crank to engage and actuate said sector-lever, and key-actuated means forengaging the sector bell-crank eli'ective to move the type-member into typing position.

5. ln a typewriting machine, the combina-l tion of a type carrying member having a slotted extension; a sector lever carrying a pin adapted to engage the slotted extension of the type member; a sector to engage and actuate the aforesaid sector lever; and a typewriter key having a pin adapted to engage and actuate the sector lever, substantially as shown tion of a platen, a rotatable type-member including a resilient bar, a key, a. sector-lever for actuating said member, a key-actuated sector-lever engaged therewith to rotate said member to a position near the typing position in the machine, and Va printing device eilective to flex said bar to press the typemember against the platen for typing.

8. ln a typewriting machine, the combination of a series of pivotally mounted front strike type members; a series of typewriter keys adapted to position the type members in printing position; a single printing mechanism, effective to co-operate with all of the type members, said mechanism includin a key-actuated toggle device, a longitudinallymovable pressure pin actuated by said toggle device and effective to engage and move the type members to print; a bearing for guiding said pin rectilinearly toward the type members; and connecting means connecting all of the keyswith the toggle device and subject to actuation by anyone of the keys to actuate the printing mechanism.

9. ln a typewriting machine, the combination of a series of type members; a series of i keys; a single printing mechanism adapted to co-operate with all of the type members, to engage and move them to print and comprising a toggle linkage controlled at one end by all of the keys and on the other end connected to a second toggle linkage connected to a pressure member, adapted to engage such one of the type members as has been set to printing position and actuate it to print.

l0. ln atypewriting machine, the combination of a series of type members; a single printing device, adapted to co-operate with all ofthe type members and comprising a double toggle linkage whereby one toggle linkage actuates the second toggle linkage,

which in turn, actuates the ty e members to print; andkeys to position t e type memtype-members, a rectilinear guide for the pressure-member, a toggle bearing against the rear of the pressure-member, a weight veifective to enhance the pressure function of the pressure-member, a second toggle supporting said weight and actuating the first-named toggle, and a connection, universal to all of the keys, to control the printing device so that it is actuated upon actuation of any one of the keys.

12. In a typewriting machine, the combination'of a series of type members; a single printing device adapted to co-operate with all i of t-he type members and comprising a toggle pressure linkage to convert motion into pressure for printing purposes; typewriter keys adapted to actuate the printing device; a motion converting connect-ion, connecting the keys with the printing device to convert movement of uniform velocity of the key into harmonic motion of the toggle pressure linkage, to st-art it from rest with gradually accelerated motion and thereby overcome its inertia gradually.

13. Ina typewriting machine, the combination of a series of type members; a single printing device adapted to co-operate with all of the type members and comprising a pressure member; a toggle mechanism to actuate the pressure member; a second toggle mechanism to actuate the iirst toggle mechanism; keys; an actuating mechanism to actuate the printing device under control of the keys; and a third toggle mechanism connecting the actuating mechanism of the keys with the aforesaid second toggle mechanism for the purpose of imparting harmonic motion to the printing device by the operation of a key.

14. In a typewriting machine, the combination of a platen, a type-member having a slotted extension, a key, a sector-lever having a pin effective to engage said extension for actuating said member, a key-actuated sectorlever engaged therewith to carry said member into a stationary position near the platen, and a key-actuated printing device including movable linkages, a member having a given mass pivoted to said linkages, eiective to :be moved bodily to store up energy of motion therein, and to rotate on its pivot to press the type-member against the platen for typing- 15.` In a typewriting machine, the combination with a platen, atype-member and a key, of a sector-lever for actuating said member, a. key-actuated sector-lever engaged therewith to carry said member into position near the platen, and a key-actuated printing device including a swingable member, a given mass pivoted thereto, effective to be moved bodily to store up energy, of motion therein, and a toggle responsive to a pivotal movement of said mass for utilizing said stored-up energy to press the type-member against the platen for typing.

16. In a typewriting machine, the combination with a platen, a series of type-members and keys for t-he same, of means actuated bythe keys to bring the type-members near to but not touching said platen, a printing device including a key-actuated toggle, a member having a given mass eii'ective to be moved by said toggle to store up energy of motion therein, a second toggle actuated thereby, and a pressure-member actuated by said second toggle to press the type-member against the platen for typing.

17. In a typewriting machine, the combination of a platen, a series of type-members including a series of type-heads and a. series of flexible bars supporting the same, a series of keys for the members, means connecting. the keys and the type-members, effective to move the same with a harmonic movement and stop the same close to the platen, and a key-actuated printing device effective to iiex said bars to press the type-members against the platen fortyping, including means for giving the printing device dissentaneous and synchronized movements with reference to the movements of the type-members.

18. In a typewriting machine, the combination of a platen, a series of pivoted typemembers, a series of actuating mechanisms for the same, means included in said mechanisms to rotate the type-bars with a decreastype-members against the platen for typing.

19. In a typewriting machine, the combination of a platen, a series of type-members, a series of keys, a series of key-actuated motion-transmitting devices, including leverarms, effective for changing the uniform velocity of the keys to first a gradually accelerated movement of the type-members and then a gradually decelerated movement of the same ending in a stop when the typemembers are close to, but not touching, the platen, `due to the construct-ion and arrangement of the lever-arms, and key-actuated printing devices including a pressure-member effective to approach the type-members with a graduallydecelerated movement, during the last part of its travel, and to nally Lafrance press the type-members against said platen 'ltor typing.

L20. lln a typewriting machine, the combination with a. platen, a series of type-members and a series ot keys, ot a series of keyactuated inotion-transmitting devices including lever-ar1ns, effective tor changing the unilform velocity of the keys to a decelerated movement of the members, throughout the last part of their travel, ending in a stop `when the same are close to, but not touching, the platen, due to the construction and ar rangement of said lever-arms, and a keyactuated printing device. including a pres sure member, effective to approach the type- Vmembers with a gradually decelerated movement, during the last part of its travel, and to finally press the type-members against the platen for typing.

2l. ln a typewriting machine, the combination of a platen, type-members, including type-heads and flexible rods supporting the same, a series ot actuating mechanisms for the sam-e, means included in said mechanisms to actuate the type-members and throughout the last part of their travel to move the same with ay decreasing velocity, means e'lective to stop the type-members near to but not touching said platen, and a key-actuated printing mechanism common 'to all ot said type-members including a pressure-bar effective to Hex said type-head rods to press the type-heads against the platen for typing.

252. ln a. typevvriting machine, the comhination with a platen, a series ot keys and a series ot type-members, of key-actuated means including a sector gearing to transmit motion from the keys to the type-members, and a printing device including a key-actuated toggle-mechanism to actuate said device, a pressuramember and a second toggle-mech anisin actuated by the tiret-named mechanism to engage the pressure-member and press the same against said type-members when the latter are in typing position.

Q3. ln a typeivriting machine, the corn-` bination with a platen, a key and a typemcinl'ier, ot' key-actuated means to transmit motion to the type-member, and a printing derice including a key-actuated toggle-mechanism, a pressure-member and a second tog- `gle mechanism actuated by the rst-named mechanism to engage the pressuremember to press the same against the type-member when it is in typing position.

Qt. lin a typevvriting machine, the `combination vvith a platen, a key and a type-member, ot means to transmit motion to the typemember, and a printing device including a presslnearnember, a ke`yactuated togglemechanisme-nd a second toggle-mechanism mechanically connected in series relation therewith, actuated by the first-named mechanism to engage the pressure-member and press the same against the type-member when Vit is in typing position.

ing a pivoted support therebetween, eective for giving the type-members and the printing device co-ordinated speeds throughout their entire travel, during the typing operation.

26. ln a typevvriting machine, the combination with a platen, a series of type-mem.- bers and a series of keys, of means connecting the keys and the members for giving the latter harmonic motions to carry them near to the platen, and a key-actuated printing device, including a double system of toggle` linkages, effective to press the members against the platen for typing.

27. lln a typevvriting machine, the combination with a platen, a series of type-members and a series ot keys, of means connecting the keys and the members :tor giving the lat* ter harmonic motions to carry them near to` the platen, and a key-actuated printing device common to all of the keysand including a double system of toggle-linkages, eli'ective to press the members against' the platen for typing.

n 28. lln a typevvriting machine, the combination with a pla-ten, a series of type-mem bers and a series of keys, of means connecting the keys and the members for giving the latter harmonic motions to carry them near to the platen, and a key/actuated printing. device, including a double system of toggle-linkages and a pressure-bar, effective to press the members against the platen for typing.

29. lin a typevvriting machine, lthe combination With a platen, a series ot typemem bers and a. series ot keys, ot means'connecting the keys and the members for giving the latter harmonic motions to carry them near to the platen, and a key-actuated printing device, including a plurality of toggle-mechanisms, etfective to press the members against the platen for typing.

30. ln a typewriting machine, the combination with a platen, a series of type members and a series of keys, of means connectlll@ ing the keys and the members tor giving the latter harmonic motions to carry the members near to the platen, and a key-actuated printing device, having mechanism including a crank and a connecting rod normally positioned on a dead center and eifective to be moved therefrom to press the members against the platen .tor typing, when the members reach their extreme positions resulting from the movements of said means.

31. In a typewriting machine, the combination with a platen, a series of type-members and a series of keys, of means connecting the keys and the members for giving the latter harmonic motion's to carry them near to the platen and then by said means come to rest, and a key-actuated printing device, including a pair of toggles and a motion-increasing linkage betweenthe same, whereby said device has a motion diiering from but synchro nized with the motions of the type-members and effective to press the members against the platen for typing. In testimony whereof I aiiix my signature.

RICHARD V. REPPERT. 

